Automatic cut-off for engines



(No Model.) z SheetsSheet 1. H. BUDDENHAGEN.

AUTOMATIC OUT-OFF FOR ENGINES. No. 417,227. Patented Dec. 17, 1889.

(-No Model.) 7 2 Sheets-Sheet 2. H. BUDDENHAG EN.

AUTOMATIG GUT-OFF FOR ENGINES; No. 417,227. Patented Dec. 17, 1889.

. UNITED STATES PATENT OFFICE.

HENRY BUDDENHAGEN, OF TOLEDO, OHIO.

AUTOMATIC CUT-OFF FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 417,227, dated December 17, 1889.

Application filed August 22,1889. Serial No. 321,637. (No model.)

To all whom it may concern:

Be it known that I, HENRY BUDDENHAGEN, a citizen of the United States, residing at T0- ledo, in the county of Lucas and State of Ohio,

have invented certain new and useful Improvements in an Automatic Out-Off for Stean1-Engines; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form part of this specification.

My invention relates to an automatic cutoff for steam-engines, and has relation to automatically controlling the stroke of the slidevalve, whereby to regulate the quantity of steam admitted to the cylinder.

The object of the invention is to render the reciprocation of the piston uniform and to effectually prevent the same from attaining too great speed. i

The invention consists in the parts and combination of parts hereinafter described, and pointed out in the claims.

In the drawings, Figure 1 is a side elevation of an engine provided with my automatic cutoff with the plate to the steam-chest removed to disclose the slide-valve and one of the ports. Fig. 2 is a side elevation of the opposite side of the steam-chest with the cylinder removed, and showing the inner side of the cut-oif mechanism. Fig. 3 is a detail View showing the connection of the eccentric-rod and valve -stem with the cutoff mechanism, and also the c011- nection of the ball-governor rod with the movable fulcrum of the bell-crank lever which effects the cutoff. Fig. 4 is a side elevation of a portion of the engine, showing the slidevalve in a position to close both ports in the steam-chest by the centrifugal action of the governor. Fig. 5 is a plan view of the steam chest and cylinder with the upper portion of each removed, the slide-valve and piston being shown in full lines.

A designates the piston, which reciprocates in a cylinder B, receiving steam from the steam-chest 0 through ports E and E, respectively, and exhausting through a port F, the steam being admitted to the cylinder in front or rear of the piston-head by the reciprocation of a slide-valve G, operated by an eccentric-rod G in the usual manner. Eccentricrod G is connected with valve G in the following manner:

H designates a lever pivoted to theenginebed at H and extending upwardly above the eccentric-rod a short distance to allow of being formed in convenient shape at I to be grasped by the operator.

J designates a bell-crank lever pivotally secured to the lever H at K, the upper end of the bell-crank lever being pivotally secured to a coupling-rod L, having a pivotal connection with the stem of valve G.

The eccentric-rod G is formed with a notch G, which engages with a projecting stud H upon lever H, whereby the reciprocation of said rod causes a forward and backward movement of the lever H upon pivot 11. The lower end of the bell-crank lever is provided with a rectangular stud M, which slidesin'a way N,

formed in a plate 0, secured upon a shaft 0, which is secured in crank-arms P, attached to the governor-rod R of a governor S.

In operation, steam being admitted to the steam-chest and the governor-balls being in their lowest position, a maximum amount of steam is admitted to the cylinder through ports E and E, for the reason that the plate 0, through the medium of the rod Q and crankarms P, is inclined to cause the stud M of bellcrank lever J to travel in way 0 in substantially the same are of a circle as the lever H upon pivot H, thereby effecting the full movement of the slide-valve and admitting a full supply of steam to the cylinder in starting the engine. As soon, however, as the piston has attained the desired reciprocatory speed and the governor-balls revolve atan angle of about twenty-five degrees from their pivotal connection theplate O is caused to assume a horizontal movement by means of the governor-rod and its connection with crank-arms P, thereby causing the stud M of the bell-crank lever to move in coincidence with the horizontal way 0, lessening the degree of oscillation of the same and causing the slide-valve to partially open the ports E and E, with-the effect of allowing a regular and normal stroke of the piston.

Should the engine attain too great speed by reason of any disconnection of the same with the machinery to which it may be attached and the centrifugal throw of the governor-ball cause the same to assume a horizontal position, the downward movement of the rod Q will cause the plate to assume an inclined position in inverse order to that described at the starting of the engine, thereby causing stud M to move in the way 0 in in verse order to the movement of the lever G and lessening the stroke of the bell-crank lever to a degree to shorten the strike-valve G sufficiently to cause the same to merely reciprocate upon the ports E and E, thereby closing the same and cutting off the steam from the cylinder with the effect of momentarily stopping the engine until the govern or-balls commence to descend, when the port E or E is uncovered and steam admitted with the effect of starting the engine.

It will be seen that the device is automatic in its operation and that by means of the perforations in the crank-arms P the rod Q can be coupled with the same to cause any desired lead to the slide-valve when the ballgovernor is at any predetermined centrifugal throw to cause a normal speed to the engine or to entirely out off the steam from the cylinder.

\Vhatl claim is 1. In an engine, a steam-chest, a slide-valve reciprocating therein and coupled with an OS- cilla ing lever, also connected with the eccentric-rod of the engine by means of a variable fulcrum-bearing in which one end of the 0scillating lever moves, as and for the purpose set forth.

2. In an engine, an eccentric-rod, a slidevalve, in combination with an oscillating bellcrank lever connected centrally to a pivotal lever and at one end with the slide-valve, the opposite end being connected with a variable bearing connected with the governor-rod, the eccentric rod being connected with the pivoted lever, as and for the purpose set forth.

3. In an engine, a governor, a verticallymovable rod connected therewith, a shaft provided with a plate at one end having a way formed therein, and crank-arms at the opposite end connected with the movable rod, in combination with a lever pivoted to the engine and having a connection with the eccentric-rod, and a bell-crank lever pivoted to said lever, one end of which moves in said way, the opposite end being connected with the slidevalve of the engine, as and for the purpose set forth.

4. In an engine, aslide-valve pivotally connected with the governor by means of a bellcrank lever connected at one end with the slide-valve and at the opposite end with the movable way, and the crank-arms connected with the governor-rod and supporting said movable way, substantially as shown and described.

In testimony that I claim the foregoing as my own I hereby affix my signature in presence of two witnesses.

HENRY BUDDENHAGEN.

Witnesses:

WILLIAM WEBSTER, CARROLL J. WEBSTER. 

